/*
	 *	jquery.suggest 1.2 - 2007-08-21
	 *	
	 *  Original Script by Peter Vulgaris (www.vulgarisoip.com)
	 *  Updates by Chris Schuld (http://chrisschuld.com/)
	 * 
	 */
	 
	(function($) {

		$.suggest = function(input, options) {
	
			var $input = $(input).attr("autocomplete", "off");
			var $where = $(input).parent().find("select");
			
			var $results;

			var timeout = false;		// hold timeout ID for suggestion results to appear	
			var loadTimeout = false;
			var prevLength = 0;			// last recorded length of $input.val()
			var cache = [];				// cache MRU list
			var cacheSize = 0;			// size of cache in chars (bytes?)
            var xhr = null;             // get request anchor
            var timeoutHideResults = false;
            
			if( ! options.attachObject )
				options.attachObject = $(document.createElement("ul")).appendTo('body');

			$results = $(options.attachObject);
			$results.addClass(options.resultsClass);
			
			resetPosition();
			$(window)
				.load(resetPosition)		// just in case user is changing size of page while loading
				.resize(resetPosition);

			$input.blur(function() {
				timeoutHideResults = setTimeout(function() {$results.hide()}, 700);
			});
			 
			 
			// help IE users if possible
			try {
				$results.bgiframe();
			} catch(e) { }


			// I really hate browser detection, but I don't see any other way
			if ($.browser.mozilla)
				$input.keypress(processKey);	// onkeypress repeats arrow keys in Mozilla/Opera
			else
				$input.keydown(processKey);		// onkeydown repeats arrow keys in IE/Safari

            $input.click(function(){ 
                if (timeout) 
                    clearTimeout(timeout);
                timeout = setTimeout(suggest, options.delay);
                prevLength = $input.val().length;
            });
            	  
            $where.change(function(){ 
                if (timeout) 
                    clearTimeout(timeout);
                timeout = setTimeout(suggest, options.delay);
                prevLength = $input.val().length;
            }); 
                            
			function resetPosition() {
				// requires jquery.dimension plugin
				var offset = $input.offset();
				$results.css({
					top: (offset.top + input.offsetHeight) + 'px',
					left: offset.left + 'px'
				});
			}
			
			
			function processKey(e) {
				
				// handling up/down/escape requires results to be visible
				// handling enter/tab requires that AND a result to be selected
				if ((/27$|38$|40$/.test(e.keyCode) && $results.is(':visible')) ||
					(/^13$|^9$/.test(e.keyCode) && getCurrentResult())) {
		            
		            if (e.preventDefault)
		                e.preventDefault();
					if (e.stopPropagation)
		                e.stopPropagation();

	                e.cancelBubble = true;
	                e.returnValue = false;
				
					switch(e.keyCode) {
	
						case 38: // up
							prevResult();
							break;
				
						case 40: // down
							nextResult();
							break;
	
						case 9:  // tab
						case 13: // return
							selectCurrentResult();
							break;
							
						case 27: //	escape
							$results.hide();
							break;
	
					}
					
				} else if ($input.val().length != prevLength) {

                    if(xhr != null)
                        xhr.abort();
                        
					if (timeout)
						clearTimeout(timeout);
				    
					timeout = setTimeout(suggest, options.delay);
					prevLength = $input.val().length;
				}			
			}
			
			var q = "";
			var where = "";
			function suggest() {
			
				q = $.trim($input.val());
                where = $where.val();
                
				if (q.length >= options.minchars && q != options.dfltValue) {
					
					cached = checkCache(q, where);
					
					if (cached) {
					
						displayItems(cached['items']);
						
					} else {
					
						if(options.loaderAnimObj)
							$(options.loaderAnimObj).css("display", "inline");
							
						if (loadTimeout)
                            clearTimeout(loadTimeout);
                        loadTimeout = setTimeout(loadData, options.loadDelay);
					}
					
				} else {
				
					$results.hide();
					
				}
					
			}
			
			function loadData()
			{
			    xhr = $.get(options.source, {q: q, where: where}, function(txt) {

                    $results.hide();
                    
                    var items = parseTxt(txt, q);
                    displayItems(items);
                    addToCache(q, where, items, txt.length);
                    if(options.loaderAnimObj)
                        $(options.loaderAnimObj).css("display", "none");
                });
			}
			
			
			function checkCache(q, w) {

				for (var i = 0; i < cache.length; i++)
					if (cache[i]['q'] == q && cache[i]['w'] == w) {
						cache.unshift(cache.splice(i, 1)[0]);
						return cache[0];
					}
				
				return false;
			
			}
			
			function addToCache(q, w, items, size) {

				while (cache.length && (cacheSize + size > options.maxCacheSize)) {
					var cached = cache.pop();
					cacheSize -= cached['size'];
				}
				
				cache.push({
					q: q,
					w: w,
					size: size,
					items: items
					});
					
				cacheSize += size;
			
			}
			
			function displayItems(items) {
				
				if (!items)
					return;
					
				if (!items.length) {
					$results.hide();
					return;
				}
				
				var html = '';
				for (var i = 0; i < items.length; i++)
					html += '<div' + (items[i]['key'] != '' ? ' id="s_'+ items[i]['key']+'"' : '' ) + '>' + items[i]['value'] + '</div>';
				
				if(items.length > 1)
					html += '<div class="all-results"><a href="/search/?q='+$input.val()+'">Все результаты</a></div>'
				
				$results.html(html).show();
				
				$results
					.children('div')
					.mouseover(function() {
						$results.children('div').removeClass(options.selectClass);
						$(this).addClass(options.selectClass);
					})
					.click(function(e) {
                                            
						//e.preleventDefault(); 
						//e.stopPropagation();
						selectCurrentResult();
					});
							
			}
			
			function parseTxt(txt, q) {
				
				var items = [];
				var tokens = txt.split(options.delimiter);
				
				// parse returned data for non-empty items
				for (var i = 0; i < tokens.length; i++) {
					
					var data = $.trim(tokens[i]).split(options.dataDelimiter);
					if( data.length > 1 ) {
						token = data[0];
						key = data[1];
					}
					else {
						token = data[0]
						key = '';
					}
					
					if (token) {
						items[items.length] = {'value':token,'key':key};
					}
				}
				
				return items;
			}
			
			function getCurrentResult() {
			
				if (!$results.is(':visible'))
					return false;
			
				var $currentResult = $results.children('div.' + options.selectClass);
				
				if (!$currentResult.length)
					$currentResult = false;
					
				return $currentResult;

			}
			
			function selectCurrentResult() {
			
				$currentResult = getCurrentResult();
			
				if ($currentResult) {
				    
					if(timeoutHideResults)
					   clearTimeout(timeoutHideResults);
					   
					/*if( $(options.dataContainer) ) {
						$(options.dataContainer).val($currentResult.attr('id').replace('s_',''));
					}*/
	
					/*if (options.onSelect) {
						options.onSelect.apply($input[0]);
					}*/

					
					// ищем ссылку в тексте
					var link = $($currentResult).find("a").attr("href");
                                        
                    if(link != "undefined")
						window.location = link;
					
					//$results.hide();
				}
			
			}
			
			function nextResult() {
			
				$currentResult = getCurrentResult();
			
				if ($currentResult)
					$currentResult
						.removeClass(options.selectClass)
						.next()
							.addClass(options.selectClass);
				else
					$results.children('div:first-child').addClass(options.selectClass);
			
			}
			
			function prevResult() {
			
				$currentResult = getCurrentResult();
			 
				if ($currentResult)
					$currentResult
						.removeClass(options.selectClass)
						.prev()
							.addClass(options.selectClass);
				else
					$results.children('div:last-child').addClass(options.selectClass);
			
			}
	
		}
		
		$.fn.suggest = function(source, options) {
		
			if (!source)
				return;
		
			options = options || {};
			options.source = source;
			options.delay = options.delay || 150;
			options.loadDelay = options.loadDelay || 500;
			options.resultsClass = options.resultsClass || 'ac_results';
			options.selectClass = options.selectClass || 'ac_over';
			options.matchClass = options.matchClass || 'ac_match';
			options.minchars = options.minchars || 2;
			options.delimiter = options.delimiter || '\n';
			options.onSelect = options.onSelect || false;
			options.maxCacheSize = options.maxCacheSize || 65536;
			options.dataDelimiter = options.dataDelimiter || '\t';
			options.dataContainer = options.dataContainer || '#SuggestResult';
			options.attachObject = options.attachObject || null;
			options.loaderAnimObj = options.loaderAnimObj || null;
			options.dfltValue = options.dfltValue ||  null;
			this.each(function() {
				new $.suggest(this, options);
			});
	
			return this;
			
		};
		
	})(jQuery);